dd: add Dutch translation and fix typo's (#12911)

pages/linux/dd.md

@@ -9,7 +9,7 @@
 
 - Clone a drive to another drive with 4 MiB block size and flush writes before the command terminates:
 
-`dd bs={{4M}} conv={{fsync}} if={{/dev/source_drive}} of={{/dev/dest_drive}}`
+`dd bs=4M conv=fsync if={{/dev/source_drive}} of={{/dev/dest_drive}}`
 
 - Generate a file with a specific number of random bytes by using kernel random driver:
 
@@ -23,6 +23,6 @@
 
 `dd if={{/dev/drive_device}} of={{path/to/file.img}}`
 
-- Check the progress of an ongoing dd operation (run this command from another shell):
+- Check the progress of an ongoing `dd` operation (run this command from another shell):
 
 `kill -USR1 $(pgrep -x dd)`